Speaker base



FIG. 1 is a perspective view of a speaker base showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, the opposite side elevational view being a mirror image thereof;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The broken line showing of the speaker housing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a speaker base, as shown and described. 